As Chaz said, easily budget for 3-4k for that swap.
I've done the swap referred to and, if I'm brutally honest, it would have made more financial sense to sell and buy a completely new car with the engine already in or any of the more modern choices of similar output.
However, there was a little more to it than that, as it was a 'voyage of discovery' for me and I've certainly gained confidence and know-how along the way, which kind of ties-in with Norm's comment.
The car is better for it, though, there's more scope for any future upgrades and it has helped to make the car feel more 'mine' in a sense. However, as said often before, a Pinto does offer adequate power that can contribute an excellent all-round car that's more than capable to performing at similar levels to other cars with more powerful or modern engines.
The 'smart' money is probably on looking at other aspects that can make a difference (handling/gearing etc..) if you do decide to keep as is, but it is so easy to get swept away by wanting more, especially when you read and hear about other cars on here and elsewhere.